November 2012

Mushroom Rock, Lustleigh Cleeve, Devon taken on a bright, crisp November day.
Mushroom Rock, Lustleigh Cleeve, Devon taken on a bright, crisp November day.
Summary for  November 2012
Mean Max: 11.6ºC (+0.2ºC)
Mean Min: 4.7ºC (-0.3ºC)
Mean: 8.2ºC (-0.0ºC)
     
High Max: 14.7ºC 14th
Low Max: 6.1ºC 30th
High Min: 11.1ºC 14th
Low Min: -2.9ºC 29th
Mean Grass Min: 1.7ºC  
Grass Min: -5.3ºC 29th
     
Rain Total (gauge): 187.3 mm (300%)
Rain Total (tipping bucket): 183.8 mm  
Rain Days >0.2 mm: 17 Days  
Rain Days >1.0 mm: 15 Days  
Max 24 hrs: 41.7 mm 21st
Days without any rain: 13  
     
Air Frost: 4 Days  
Grass Frost: 8 Days  
Snow Falling: 0 Days  
Snow (50%) @ 9am: 0 Days  
Ice Days: 0 Days  
Thunder Heard: 0 Days  
Hail <5 mm: 0 Days  
Hail >5 mm: 0 Days  
Fog @ 9am: 2 Days  
     
Total Monthly Sunshine: 93.8 Hours (101%)
Most Sunshine in a Day: 8.4 Hours 11th
Average Daily Sunshine: 3.1 Hours  
Sunless Days: 7 Days  
Cloudless Days: 3 Days  
Total Possible Sunshine: 268.9 Hours  
Percentage of Total Sun: 35%  
Maximum UV Index: 1.6 2nd 
Time of Max UV:   12:00
     
Mean Soil Temp @ 30 cm: 10.2ºC  
Min Soil Temp @ 30 cm: 8.4ºC 30th
Max Soil Temp @ 30 cm: 11.5ºC 1st
Mean Soil Temp @ 100 cm: 12.2ºC  
Min Soil Temp @ 100 cm: 11.6ºC 30th
Max Soil Temp @ 100 cm: 13.6ºC 1st
     
Mean 10 Min Wind >39 mph: 0.00 Days  
N: 7.28 Days  
NE: 0.68 Days  
E: 1.46 Days  
SE: 0.95 Days  
S: 8.24 Days  
SW: 2.72 Days  
W: 0.74 Days  
NW: 4.31 Days  
Calm: 3.63 Days  
Wind Chill Low: -3.1ºC 29th
Mean Wind: 3.1 mph  
Max Gust: 53 mph 22nd 
     
Mean Cloud Cover: 64%  
Mean RH @ 9am: 95%  
Rain Duration >0.1mm/hour: 74.3 Hours  
Frost Duration: 34.0 Hours  
Max Frost Duration in a Day: 13.3 Hours 30th
     
Mean Sea Temperature: 12.2ºC (-0.6ºC)
Normal for Month: 12.8ºC  
Max Sea Temperature: 13.2ºC 1st
Min Sea Temperature: 11.4ºC 30th
     
Mean Pressure @ 9am: 1010.1 hPa (-5.6 hPa)
Mean Pressure: 1009.5 hPa (-6.2 hPa)
Max Pressure: 1028.6 hPa 7th
Min Pressure: 976.6 hPa 1st
Max Change in 24 hours: 23.2 hPa 5th
   
Radiation Daily Mean: 4.2 MJ/m²  
Max Daily Value: 8.7 MJ/m² 5th
Min Daily Value: 0.5 MJ/m² 24th
Number of Days with Data: 30 Days  
1-Hour Maximum: 549 W/m² 1st
Starting Time of the Hour:   12:00
     
Max Dewpoint: 13.4ºC 20th
Min Dewpoint: -3.7ºC 29th
Mean Dewpoint: 6.0ºC  
     
Max Humidity: 99% 1st
Min Humidity: 67% 1st
Mean Humidity: 88% (+2)

 

Benign, mild, sunny and dry until the 20th, then wild, often windy and very wet.

Mild and often rather settled right through until the 20th then a big change to windier and wetter conditions but remaining mild until the last few days of the month. The last two days had fairly sharp frosts for this location.
November is normally a wet month but this month it was very wet with extremely heavy rainfall falling between the 20th and the 26th. This led to serious flooding for the 4th time this year, and also many landslips and cliff-falls.
November often sees the first air frosts of the season, and this year was no exception. Though the frosts at the end of the month were a little sharper than normal. As usual for November, no snow was seen falling or lying.
Sunshine amounts were around average despite a very dull 4th week. This cloudy week led to a high amount of days without any sunshine, though there were 3 cloudless days of unbroken sunshine to compensate.
Soil temperatures slowly declined throughout the month, with the temperature dropping more rapidly with the arrival of colder weather during the final week of the month.
An extremely windy day on the 22nd with a total wind run of 304 miles. Gusts of over 50 mph were recorded for much of the day leading to many fallen trees and rock falls along the coast due to rough seas eroding the base of the cliffs. Winds dominated from the northerly and southerly directions. Overall though, the mean wind speed was only 3.1 mph despite the very windy spell during the 4th week. This was due to the benign, rather windless conditions that dominated the first 3 weeks of the month.
The rainfall duration of 74 hours does not reflect the high amount of rainfall that actually fell during this month. This was due to the rain being predominantly heavy in nature.
Sea surface temperatures stayed reasonably high until the 28th then dropped significantly due to a run of cold nights.
Mean pressure was rather below the average for November despite the reasonably settled first 3 weeks.
A new sensor has been added that measures solar irradiance in watts per square metre falling on a horizontal surface.
Dewpoints were slightly below the average.
Relative humidity was a little above normal.
Weather Data for Otter Valley, Devon.  November 2012  
  Temp oC Grass Hum (%) Soil oC DP (oC) Wind (mph) Rain Air (hPa) W/m² UV Sun  
  Min Max Min Min Max 30 100 Min Max Max Ave Run mm Min Max Max Max Hours Observations
1 3.1 11.1 1.4 67 99 11.5 13.6 2.5 7.3 20 2.0 47 0.5 977 987 549 1.4 6.4 Sunny intervals all day
2 3.2 11.7 -0.1 68 97 11.0 13.5 1.8 6.0 18 3.0 72 1.8 987 996 518 1.6 5.3 Sun & light showers all day
3 1.6 10.5 -0.4 69 98 10.4 13.3 0.8 5.4 16 2.4 57 0.0 994 999 431 1.3 4.0 Sunny intervals all day
4 2.2 11.1 0.9 84 98 10.0 13.1 0.8 8.6 14 1.5 36 18.8 991 999 471 1.3 6.7 Sunshine & showers all day
5 3.4 11.2 0.0 67 99 9.8 12.8 1.1 7.0 16 1.8 42 0.0 993 1017 479 1.2 7.4 Sunny intervals all day
6 -0.6 12.5 -2.1 72 99 9.4 12.5 -1.4 8.9 15 1.4 33 0.0 1017 1026 442 1.4 5.5 Sunny intervals all day
7 4.2 12.3 1.0 75 99 9.4 12.3 3.3 8.5 11 1.2 29 0.0 1025 1029 314 1.2 0.6 Brief sunny intervals all day
8 7.4 13.5 1.5 68 98 9.8 12.2 3.4 10.0 10 0.9 22 0.0 1019 1025 381 1.4 3.2 Sunny intervals all day
9 4.9 10.8 3.0 83 98 10.0 12.1 3.6 8.9 17 3.0 72 1.0 1002 1019 104 0.6 0.0 Cloudy all day
10 6.1 12.7 1.5 68 99 10.1 12.1 3.5 8.7 12 0.6 16 3.3 997 1002 439 1.3 6.5 Sunny intervals all day
11 0.3 13.1 -1.0 68 99 9.8 12.0 -0.3 8.1 10 0.6 15 0.0 1001 1019 480 1.2 8.4 Sunny all day
12 4.8 14.0 3.0 93 99 9.5 12.0 3.9 13.0 15 1.6 39 2.6 1019 1023 142 0.8 0.4 Brief sunny intervals all day
13 8.8 13.9 4.0 87 99 9.9 11.9 6.0 13.1 19 2.7 66 0.0 1023 1027 169 1.0 0.0 Cloudy all day
14 11.1 14.7 2.3 73 97 10.5 11.9 4.1 11.4 12 1.2 29 0.0 1024 1026 465 1.3 6.3 Sunny intervals all day
15 4.1 10.4 1.8 86 99 10.5 11.9 3.2 8.4 7 0.3 8 0.0 1020 1025 101 0.6 0.0 Cloudy all day
16 8.6 12.4 8.6 92 98 10.6 12.0 7.5 11.9 11 1.3 30 1.5 1008 1020 80 0.6 0.0 Cloudy all day
17 9.0 12.8 1.5 79 99 10.9 12.0 3.7 12.5 14 2.0 49 1.5 1006 1012 262 1.0 1.6 Sunny ints am, cloudy pm
18 -0.4 11.1 -1.4 75 99 10.6 12.0 -0.9 7.8 18 1.4 34 0.0 1012 1016 390 1.0 6.1 Sunny all day
19 10.1 12.5 6.5 74 98 10.1 12.0 4.8 12.1 34 11.4 273 1.5 1007 1014 83 0.5 0.0 Cloudy all day
20 10.7 13.8 9.9 94 99 10.7 12.0 10.1 13.4 33 8.0 208 19.3 1004 1008 80 0.0 0.0 Rain am, cloudy pm
21 5.6 12.3 1.9 78 99 11.1 12.0 5.0 10.9 23 3.4 81 41.7 1000 1015 449 1.0 3.9 Rain am, sunny intervals pm
22 8.0 12.9 4.4 87 96 11.0 12.0 6.6 11.4 53 14.0 304 15.2 1003 1014 82 0.5 0.4 Sunny ints am, very windy.
23 3.6 11.9 1.0 82 99 10.9 12.0 2.1 9.7 12 1.1 27 0.5 1006 1016 362 1.0 2.2 Sunny intervals all day
24 2.3 11.2 0.9 97 99 10.4 12.1 1.7 10.8 22 3.7 82 39.6 993 1016 35 0.0 0.0 Rain all day
25 6.8 12.2 3.1 80 99 10.5 12.0 4.2 12.0 36 7.7 183 30.1 990 1008 287 0.9 2.3 Sunny ints am, showers pm
26 6.1 10.4 3.6 87 99 10.5 11.9 5.7 8.7 24 2.3 56 6.9 996 1003 398 0.8 2.6 Showers am, sunny ints pm
27 5.7 9.3 3.9 82 95 10.3 11.8 4.3 7.3 19 5.5 132 1.8 1003 1013 252 0.8 0.7 Sunny intervals all day
28 6.5 8.9 -1.4 69 91 10.0 11.7 0.7 5.0 20 5.1 122 0.0 1013 1018 404 1.0 3.6 Sunny intervals all day
29 -2.9 8.1 -5.3 69 98 9.4 11.7 -3.7 2.8 9 0.5 13 0.0 1013 1018 376 0.9 7.7 Sunny all day
30 -2.3 6.1 -4.5 84 97 8.4 11.6 -3.2 3.7 4 0.2 5 0.0 1012 1015 302 0.8 2.0 Sunny intervals all day
4.7 11.6 1.7 79 98 10 12.2 2.8 9.1 18 3.1 2179 187.8 1005 1014 311 0.9 94  

Graphs for November 2012
Figure 1. Temperature and Rainfall for November 2012.
Figure 2. Sunshine, UV Index and solar irradiance for November 2012.
Figure 3. Wind direction for November 2012.
Figure 4. Soil & Sea surface temperature for November 2012.
Figure 5. Mean wind speed, calm hours and air pressure for November 2012.